code: def custom_atc_mm():
      return h2o.upload_custom_metric(
          CustomAtcFunc, func_name="Custom ATC", func_file="mm_atc.py"
      )
  
file_path: h2o-3/h2o-py/tests/testdir_algos/uplift/pyunit_custom_metric_uplift.py
imports: import sys
  import h2o
  from tests import pyunit_utils
  from tests.pyunit_utils import CustomAteFunc, CustomAttFunc, CustomAtcFunc, uplift_binomial_model, assert_correct_custom_metric
  from h2o.estimators.uplift_random_forest import H2OUpliftRandomForestEstimator
label_desc: Use image node_id 3 for calling a global function with example usage: custom_atc_mm() and returns: h2o